RFR: 8320965: Scrolling on a touch enabled display fails on Wayland [v2]

[Kevin Rushforth]

On Mon, 18 Dec 2023 21:56:09 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> As an FYI, we use GTK 3.22 on our CI build machines so I wouldn't want to see the build-time dependency move any higher than it currently is.
>
> The suggestion was to allow building on 16.04 - so it's easier to test. But it currently does not build because of code introduced on Platform Preferences API. On the other hand, maybe it's best to fail so we make sure building requires 3.20.

The native Platform Preferences code is failing for an entirely different reason (a too-old compiler), but you raise an interesting point.

If we really can't support building a distributable binary on a system with a too-old GTK library in a way that enables using a new feature like this, we might prefer to "fail fast" at build time, rather than produce a binary that doesn't support the new capability even when running on a newer system.

If we decide that is a reasonable thing to do, we might want the minimum _build-time_ version of GTK to be higher than the minimum version we support at _runtime_.

I think we shouldn't necessarily tie that decision to this PR. So I think the current approach in this PR: allow it to build on an older GTK without using the new functionality, is probably OK (although not ideal as evidenced by this discussion).

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PR Review Comment: https://git.openjdk.org/jfx/pull/1305#discussion_r1430703990